Who invented air conditioning! When did the air conditioner come in?

American Willis Carrier Company designed the first air conditioning system in 1902. 1906, who applied for an American patent in the name of "air handling device". Carrier's invention originated in a printing workshop. Due to the change of air temperature and humidity, the printing machine makes the paper stretch, the oil colors are not arranged correctly, and the printed things are blurred. For this reason, Carrier has opened the door to the commercialization of air conditioners. In the next 20 years, Carrier's air conditioners were gradually used to adjust the temperature and humidity in the production process. And enter many industries, such as chemical, pharmaceutical, food, arms and other industries. In the 20 years after the invention of air conditioning, the object of enjoyment has always been machines, not people. 1922 carrier engineering co., ltd. has successfully developed a landmark product in the history of air conditioning-centrifugal air conditioner, referred to as centrifuge. The biggest feature of centrifuge is its high efficiency, which opens the door for large space air conditioning. Since then, people have become the object of air conditioning services. Air conditioning is actually popularized through cinemas. In the 1920s, the entertainment industry was depressed in summer, because no one wanted to spend money on hot money. 1925 One day, Carrier and new york Rivali Grand Theatre jointly launched the slogan "Enjoy both emotions and senses". There was a sea of people outside the Rivali Theatre that day, but almost everyone brought a paper fan just in case. However, the coolness of entering the theater gate completely conquered the audience. Since then, air conditioning has entered a stage of rapid development. The development of household air conditioners began in the mid-1920s. 1928 Carrier introduced the first generation of household air conditioners. However, due to the Great Depression and World War II, the economy took off after the 1950 s, and household air conditioners began to really enter thousands of households.